Microstructure-based cleavage modelling to study grain size refinement and simulated heat affected zones of S690 high strength steel

Quanxin Jiang*, Virgínia M. Bertolo, Vera Popovich, Jilt Sietsma, Carey L. Walters

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Study of the cleavage behavior of heat treated S690 steel by a microstructure-based approach combined with finite element analysis is present in this paper. Cleavage simulations of steels subjected to heat treatments that cause grain refinement or simulate heat affected zones are performed, and are compared with experiments. It is found that the experimental improvement of toughness from grain refinement is 80% of what would be expected based on the model. The 20% difference is due to the lower number fraction of high-angle misorientation boundaries. It is also found that the resistance to micro-crack propagation is more effective in heat affected zones, which can be explained by the residual compressive stress in martensite-austenite constituents. This research assesses the balance between microstructural parameters for controlling cleavage toughness.

Original languageEnglish
Article number145184
Number of pages10
JournalMaterials Science and Engineering A
Publication statusPublished - 2023


  • Cleavage
  • Grain refinement
  • HAZ
  • Local approach to fracture
  • Multi-barrier modelling

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